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Commitments and Contingencies (Details) - USD ($)
3 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Operating Leases    
Operating lease rent expense $ 106,192 $ 115,030
Commitments under Operating Leases    
Less than one year 306,153  
One to three years 119,614  
Total 425,767  
Fixed time charter    
Fixed Time Charter Contracts    
Less than one year 47,473,113  
One to three years 46,936,227  
Three to five years 3,443,252  
Total $ 97,852,592